Drill



Dec. 29, 1959 H. E. MILLER 2,918,954

DRILL Original Filed Nov. 12. 1954 Fig./ i Fig. 2

Hairy E. Miller INVENTOR.

WWW

United States Patent DRILL Harry E. Miller, Johnstown, Pa.

Original application November 12, 1954, Serial No. 468,339, now PatentNo. 2,842,015, dated July 8 1958. Divided and this application May 27,1958, Serial No.

' 3 Claims. (Cl. 145-125) This invention generally relates to a drilland more particularly forms a division of copending application SerialNo. 468,339, filed November 12, 1954 for Drill and now Patent No.2,842,015 issued July 8, 1958.

An object of this invention is to provide a drill having a shanktogether with cutting means at one end thereof and a pilot or guidedrill of smaller dimensions than the cutting means for boring apreliminary aperture and forming a pilot or guide for the cutting means.

Another object of the present invention is to provide a drill having anovel cutting means in which the material that is bored out of thearticle in which the hole is being bored is removed from the area ofboring thereby reducing the friction and heat and generally efiecting anefl'icient operation.

A further object of the present invention is to provide a drill having atapered bore in the lower end thereof for receiving the tapered end of aguide drill or pilot drill thereby securing the pilot drill to the maindrill shaft.

A further important object of the present invention is to provide adrill that is simple in construction, easy to use, versatile in utility,well adapted for its intended purposes and relatively inexpensive tomanufacture.

, These together with other objects and advantages which will becomesubsequently apparent reside in the details of construction andoperation as more fully hereinafter described and claimed, referencebeing had to the accompanying drawings forming a part hereof, whereinlike numerals refer to like parts throughout, and in which:

Figure 1 is a side elevation of the drill of the present invention;

Figure 2 is a longitudinal, vertical sectional view taken substantiallyupon the plane passing along section line disposed on the longitudinalaxis of the device;

Figure 3 is an end view of the working end of the drill; and

Figure 4 is a perspective view of a tool used in dislodging the pilotdrill from the main drill.

Referring now specifically to Figures 1-3, the numeral generallydesignates the drill of the present invention which includes a generallyelongated shank 12 having a tapered portion 14 for engagement in asuitable chuck and also including a plurality of longitudinallyelongated flutes 16 formed by a plurality of longitudinal grooves 18.The lower end of the flutes 16 are enlarged as indicated by the numeral20 and are pointed and sharpened at the lower ends 22. A groove 24 isprovided in the peripheral surface of the shank 12 for removing andurging the material that has been bored upwardly to an out-of-thewayposition. The lower end of the shank 12 is provided with an axial bore26 having a tapered upper end portion in communication with an inwardlyand downwardly extending bore 28 providing access to the upper end of anintermediate member 30 that is provided with a tapered upper end portion32 for engagement in the bore 26. A suitable setscrew 34 is provided forsecurely locking the intermediate member 30 within the bore 26. In thePatented Dec. 29, 1959 lower end of the intermediate member 30 is atapered bore 36 having the tapered upper end 38 of a drill bit 40therein with a suitable setscrew 42 being provided for locking the drillbit therein and also, it will be understood that a suitable bore may beprovided for engaging the upper end of the drill bit 40 for dislodgingthe drill bit 40 from the intermediate member 30. The intermediatemember 30 at the lower end thereof is provided with a peripheral flangedesignated by the numeral 44 and includes a plurality of cutting edges46. Also, the drill bit 40 is provided with spiral grooves 48 and asharpened cutting end 50 wherein the drill bit 40 together with theintermediate member 30 and the cutting edges 46 thereon will form apilot for cutting material such as wood or the like.

Figure 4 illustrates a tool 52 having a flatted and pointed end 54 thatis provided for insertion into the bore 28 for engagement with the upperend of the tapered portion 32 of the intermediate member 30 so that theintermediate member 30 as well as the drill bit 40 may be expeditiouslydislodged from the tapered bore 26.

In operation, the device will be utilized in drilling apertures throughwood regardless of the condition thereof and the particular arrangementof the pilot grill in conjunction with the main cutting member willgreatly facilitate the accuracy of the drilling operation and reduce theWear on the bit and the heating up of the bit caused by the condition ofthe wood. The drill bits as illustrated have been extensively used indrilling holes through various types of wood having various knottyconditions with a minimum of wear, heating up, breakage and timeexpenditure. The material being cut by the cutting edges 22 will becarried upwardly by the spiral groove construction of and the particularconstruction of the flutes and grooves provides a highly novelconstruction which is not only efficient but long lasting and notsubject to excessive wear or damage.

The foregoing is considered as illustrative only of the principles ofthe invention. Further, since numerous modifications and changes willreadily occur to those skilled in the art, it is not desired to limitthe invention to the exact construction and operation shown anddescribed, and accordingly, all suitable modifications and equivalentsmay be resorted to, falling within the scope of the invention asclaimed.

What is claimed as new is as follows:

1. A drill comprising an elongated shank, cutting means integral withone end of said shank, and auxiliary cutting means extending axiallyfrom the same end of said shank, said auxiliary cutting means includinga drill bit, said drill bit having a tapered upper end for engagement ina tapered bore in said shank, said drill bit including a separateintermediate section having a cutter on the end thereof remote from theintegral cutting means on the shank, and an aperture communicating withthe inner end of the tapered bore for receiving a tool for loosening thedrill bit, said shank having a spiral groove thereon for removingmaterial cut by the integral cutting means on the shank, said integralcutting means on the shank including a plurality of longitudinallyelongated flutes having sharpened enlarged lower ends for boring throughmaterial.

2. A compound drill device comprising an elongated shank adapted to besecured to the rotating spindle of a drill, said shank having aninwardly extending tapered socket in one end thereof, a peripheralflange on said shank at said one end, a plurality of longitudinallydisposed tapered flutes on said one end of the shank with the ends ofthe flutes being enlarged to form the peripheral flange and having theirlower edge sharpened for cutting material, a tapered bit assemblydisposed in said socket, said tapered bit assembly including an uppersection having a tapered upper end detachably received in the socket,and a lower section including a tapered drill bit extending axially fromthe lower end of the upper section, the tapered upper section having atapered socket for detachably receiving the upper end of the tapereddrill bit thereby connecting the sections.

3. The combination of claim 2 wherein said upper section is providedwith a peripheral flange at the lower end thereof and a plurality ofradial teeth formed therein References Cited in the file of this patentwith the radial teeth having an axially facing cutting edge. 102,832,386

UNITED STATES PATENTS Revenaugh Nov. 14,

Champion May 17,

Wood Feb. 11,

Webb Nov. 6,

McCurdy Nov. 13,

Van Dalen Apr. 29,

